In the female, the eggs, or ova are produced in the ovaries and released during ovulation into the fallopian tubes about halfway thru the menstrual cycle. If fertilization occurs, the resulting zygote travels down the fallopian tube to the uterus, where it implants and proceeds development. If the ovum is not fertilized, it proceeds its journey toward the uterus, where it degenerates and is released in the menstrual flow thru the vagina during period.